The true statements are that the diameter is 5 in, the base area is 19.63 in², the volume is 58.88in³ and the cost is $14.72.
Since the radius is 2.5 in, the diameter is 2*2.5 = 5.
The base is a circle. Therefore the base area is found by the formula
A=πr²=(3.14)(2.5)²=19.625≈19.63in².
The volume of a cone is given by multiplying the base area by the height and then taking 1/3 of it:
19.625(9)/3 = 58.875≈58.88in³.
The cost would be 58.88*0.25 = $14.72.
